Function notation is a way to name a
function that is defined by an equation. For an equation in x
and y, the symbol f (x) replaces y and is read as "the value
of f at x" or simply as "f of x."
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7.6943 = 76943/10000
The answer to 7.9*10^-6 - 7.9*10^-6 is 0 and that does not need any other notational embellishment.
Not every relation is a function. But every function is a relation. Function is just a part of relation.
The cubic function.
In this instance, the "x" means "times" or "multiplied by". When dimensional indicators (numbers) are inserted for "width" and "height", a perimeter value may be easily calculated. Mathematically speaking, it is merely a notational device. Any character "could be used", but standardization throughout a method of communication is desirable for all.